CN209830188U

CN209830188U - Sand core mould

Info

Publication number: CN209830188U
Application number: CN201920316355.XU
Authority: CN
Inventors: 徐青
Original assignee: Shibet Technology Investment (china) Co Ltd
Current assignee: Vitesco Automotive Tianjin Co Ltd
Priority date: 2019-03-13
Filing date: 2019-03-13
Publication date: 2019-12-24
Anticipated expiration: 2029-03-13

Abstract

The utility model relates to a sand core mould, which comprises an outer mould component and an inner mould component, wherein the outer mould component comprises a plurality of outer moulds which jointly enclose a cylindrical inner cavity, the inner mould component comprises at least three inner moulds which are mutually butted in series along the circumferential direction and enable the inner mould component to be cylindrical, the inner peripheral surface of the inner cavity limited by the outer mould component is provided with an outer spiral groove which continuously extends along the circumferential direction, the outer peripheral surface of the inner mould component is provided with an inner spiral groove which continuously extends along the circumferential direction, the inner peripheral surface of the outer mold assembly and the outer peripheral surface of the inner mold assembly engage each other and the outer spiral groove and the inner spiral groove cooperate with each other to form a spiral cavity for receiving the sand core casting, and the at least three inner molds are configured to be sequentially movable radially inwardly to disengage the sand core castings upon opening of the molds, the plurality of outer molds are configured to be movable radially outwardly to disengage the sand core castings upon opening of the molds.

Description

Sand core mould

Technical Field

The utility model belongs to the technical field of the casting, concretely relates to a psammitolite mould for making psammitolite, it is particularly suitable for making the integral type psammitolite that has more complicated shape (like the spiral).

Background

In the face of increasingly stringent emissions regulations and ever decreasing petroleum fuel inventory, the development of electric vehicles has become one of the options for the various entities in the automotive industry. The main cooling mode of an electric motor of an electric automobile is liquid cooling, and in order to improve the cooling effect, a common mode at present is to arrange a spiral flow channel in a shell of the motor, so that heat can be taken away to the maximum extent when cooling liquid flows through.

In the manufacture of such motor housings with helical flow channels, it is known to use separate sand cores which are then glued together. The sand core manufacturing technology has the disadvantages of complex manufacturing process, multiple process steps and low production rate.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving at least the above-mentioned defect that exists among the prior art through proposing following psammitolite mould.

A sand core mould comprises an outer mould component and an inner mould component, wherein the outer mould component comprises a plurality of outer moulds which jointly enclose a cylindrical inner cavity, the inner die assembly comprises at least three inner dies which are mutually butted in series along the circumferential direction to make the inner die assembly in a cylindrical shape, the inner circumferential surface of the outer die component for limiting the inner cavity is provided with an outer spiral groove which continuously extends along the circumferential direction, the outer circumferential surface of the inner die component is provided with an inner side spiral groove which continuously extends along the circumferential direction, the inner peripheral surface of the outer die assembly and the outer peripheral surface of the inner die assembly engage each other and the outer and inner spiral grooves cooperate with each other to form a spiral cavity for receiving a sand core casting when the dies are closed, and the at least three inner molds are configured to be sequentially movable radially inwardly to disengage the sand core castings upon opening of the molds, the plurality of outer molds are configured to be movable radially outwardly to disengage the sand core castings upon opening of the molds.

Further, the at least three inner dies are formed by dividing the cylindrical body in the circumferential direction, each of the inner dies is abutted with the adjacent inner die on both sides in the circumferential direction via the first side face and the second side face, wherein at least one of the inner dies is configured as a pilot inner die whose first side face and second side face are parallel to each other or extend close to each other toward the radially outer side.

Further, the at least three inner dies include two pilot inner dies diametrically opposed to each other.

Further, the at least three inner dies include another two inner dies having the same shape as each other or another four inner dies having the same shape as each other, in addition to the two pilot inner dies.

Further, the outer die assembly includes first and second outer dies having the same shape and disposed opposite to each other.

Further, a plurality of cylindrical cavities communicated with the outer spiral grooves are further arranged in the outer die assembly.

Further, the plurality of cylindrical cavities includes a first plurality of cavities extending radially outward to form core locator posts.

Further, the plurality of cylindrical cavities includes two second cavities disposed at both ends of the outer helical groove to form columns integral with the sand core casting.

Through the technical scheme above, the utility model discloses a psammitolite mould can make integral psammitolite, promotes the production efficiency and the quality of psammitolite.

Drawings

Exemplary embodiments of the present invention are described with reference to the accompanying drawings, in which:

fig. 1 is an exploded view of an exemplary sand core mold and sand core made according to the present invention.

Fig. 2 is a plan view of the core mold shown in fig. 1 in a clamped state.

Fig. 3 is a sectional view taken along a section line T-T in fig. 2.

Fig. 4 is a top view and a side view of the sand core shown in fig. 1.

Fig. 5 is a schematic view of the opening sequence of the sand core mold shown in fig. 1.

The figures are purely diagrammatic and not drawn to scale, and moreover they show only those parts which are necessary for the elucidation of the invention, other parts being omitted or merely mentioned. That is, the present invention may include other components in addition to those shown in the drawings.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings. It should be noted that the terms "first", "second", and the like, as used herein, are not intended to be clear in order, nor to limit the structure, but merely to distinguish technical features of the components.

Figure 1 illustrates in general exploded view a sand core mould and a sand core manufactured therefrom according to one embodiment of the invention. Fig. 2 is a plan view of the core mold in a clamped state. As can be seen in the figure, the sand core mould may comprise an outer mould assembly 1 and an inner mould assembly 2. The outer die assembly 1 comprises a first outer die 11 and a second outer die 12 which together define a cylindrical inner cavity, the specific construction of the inner die assembly 2 being described in more detail below. After the dies are closed, the inner die assembly 2 is disposed within the cylindrical inner cavity of the outer die assembly 1, whereby a manufactured sand core (or sand core casting) 3 is formed between the inner die assembly 2 and the outer die assembly 1.

The specific construction of the inner die assembly 2 will be seen in conjunction with figure 2. The inner die assembly 2 specifically includes a first inner die 21, a second inner die 22, a third inner die 23, a fourth inner die 24, a fifth inner die 25, and a sixth inner die 26 which are circumferentially abutted in series with each other so that the entire inner die assembly 2 is cylindrical. The six inner dies are formed, for example, by dividing a cylindrical body in the circumferential direction, and each inner die abuts against adjacent inner dies located on both sides in the circumferential direction via the first side face and the second side face. Wherein the at least one inner die is configured as a leading inner die whose first side surface and second side surface are parallel to each other or extend close to each other toward the radial outside. In the application, the pilot inner die refers to an inner die which moves firstly when the sand core die is opened, and other inner dies can move continuously to be separated from the sand core casting after the pilot inner die is moved away. In the illustrated embodiment, the two side surfaces of each of the second and fifth inner dies 22, 25 as the pilot inner die are parallel to each other, while the remaining four inner dies 21, 23, 24, 26 are identical in shape to each other, and the two side surfaces of each are in a perpendicular relationship to each other. The internal mold adopting the structural form can ensure that the internal mold component 2 is smoothly demoulded, thereby manufacturing the sand core 3 with an integral structure. Details regarding specific demolding will be discussed below in connection with fig. 5.

Fig. 3 is a sectional view taken along line T-T in fig. 2, from which the concrete structure of the core mold and the core after completion of the manufacture of the core 3 and before the mold opening can be clearly seen. In this state or during clamping, the inner circumferential surface of the outer mold assembly 1 and the outer circumferential surface of the inner mold assembly 2 are joined to each other. As will be understood from fig. 1, outer spiral grooves extending continuously in the circumferential direction are provided on the inner peripheral surfaces defining the cylindrical inner cavities by the first outer mold 11 and the second outer mold 12, while inner spiral grooves extending continuously in the circumferential direction are provided on the outer peripheral surfaces of the inner mold assembly 2 engaging with the inner peripheral surfaces of the outer mold assembly 1, and the outer and inner spiral grooves cooperate with each other to form spiral cavities for accommodating the sand core castings 3. In the manufacturing process of the sand core, after the outer mold component 1 and the inner mold component 2 are closed, prepared sand core raw materials are injected into a sand core mold, and the sand core is solidified, so that the sand core is molded. The raw materials of the sand core can be the materials known in the prior art, such as sand, curing agent, resin and additive, and can be obtained by proper proportioning.

Fig. 4 shows the structure of the sand core 3 in isolation in top and side views. As can be seen from this figure, the sand core 3 is generally spiral and is provided with a main positioning column 31 and an auxiliary positioning column 32, and two columns 33 for forming the inlet and outlet of the motor spiral water channel, respectively. The main positioning pillars 31 and the auxiliary positioning pillars 32 preferably extend radially outward and are perpendicular to each other, and the number thereof may be set as required. Two columns 33 are located at the two ends of the sand core 3, respectively. Although the embodiment shown in fig. 4 shows two cylindrical bodies 33 for forming the water inlet and the water outlet which are coincident with each other in the top view direction, other arrangements may be made as necessary, for example, such that they are angled with respect to each other in the top view direction. To form the positioning posts 31, 32 and the cylindrical bodies 33, a plurality of cylindrical cavities communicating with the outer spiral grooves are correspondingly provided on the outer mould assembly 1. More specifically, the plurality of cylindrical cavities includes a plurality of first cavities extending radially outward to form positioning posts 31, 32, and two second cavities provided at both ends of the outer spiral groove to form columns 33. At the time of molding, the main positioning column 31, the auxiliary positioning column 32, and the columnar body 33 are integrally formed with the sand core 3.

An exemplary configuration of the sand core mold and sand core of the present invention has been described in detail above. The opening of the sand core mold will now be described with reference to fig. 5. The direction of movement of the respective inner and outer dies of the sand core die is shown by arrows a to H in fig. 5. In opening the molds, first, the first and second outer molds 11 and 12 of the outer mold assembly 1 are moved simultaneously or sequentially in the directions indicated by arrows a and B, respectively (i.e., radially outward), so that the first and second outer molds are released from the core castings. Then, the two pilot inner dies 25 and 22, whose first and second side faces are parallel to each other, are moved simultaneously or sequentially in the directions of the arrows C and D, respectively (i.e., toward the radially inner side). Finally, the remaining four inner dies 21, 23, 24 and 26 are moved simultaneously or sequentially in the direction of the arrow E, F, G, H (i.e., toward the radially inner side). Therefore, smooth demolding of the inner mold assembly can be realized, and the integrally molded sand core is obtained.

Although in the embodiment shown in the drawings, the first and second side surfaces of the two pilot inner dies 22, 25 that move first in the inner die assembly are parallel, in order to further facilitate the die release, the first and second side surfaces of the two pilot inner dies may be provided so as to extend close to each other toward the radially outer side.

In addition, as can be seen from the above description of the split mold, the number of the inner molds of the inner mold assembly 2 of the present invention does not necessarily need to be 6, but may be other numbers as long as smooth demolding can be ensured. For example, the first inner die 21 and the sixth inner die 26 may be combined into one, and the third inner die 23 and the fourth inner die 24 may be combined into one, so that after the second inner die 22 and the fifth inner die 25, which are pilot inner dies, move radially inward, the remaining two inner dies may move radially inward again. In addition, only one inner pilot die, in which the first side surface and the second side surface are parallel to each other or extend close to each other toward the radial outer side, may be provided, as long as the single inner pilot die moves away toward the radial inner side, the remaining inner dies can move away in sequence. In general, it is sufficient if there are at least three inner molds and they are configured to be sequentially movable radially inwardly to disengage from the sand core castings upon opening of the molds.

In addition, the shape and number of the outer dies constituting the outer die assembly 1 are also not limited to the two outer dies 11 and 12 which are identical in shape and are disposed oppositely, as long as each outer die is configured to be movable toward the radially outer side in sequence or simultaneously at the time of mold opening to be disengaged from the sand core casting. Also, the outer mold member 1 may be demolded after the inner mold member 2 is demolded.

The foregoing description is only exemplary of the principles and spirit of the invention. It will be appreciated by those skilled in the art that changes may be made in the described examples without departing from the principles and spirit thereof, and that such changes are contemplated by the applicant and fall within the scope of the invention as defined in the claims.

Claims

1. A sand core mould comprises an outer mould component (1) and an inner mould component (2), and is characterized in that,

the outer mold assembly comprises a plurality of outer molds which jointly enclose a cylindrical inner cavity, the inner mold assembly comprises at least three inner molds which are mutually butted in series along the circumferential direction so as to enable the inner mold assembly to be cylindrical,

the inner circumferential surface of the outer die assembly (1) for limiting the inner cavity is provided with an outer spiral groove which continuously extends along the circumferential direction, the outer circumferential surface of the inner die assembly (2) is provided with an inner spiral groove which continuously extends along the circumferential direction, the inner circumferential surface of the outer die assembly and the outer circumferential surface of the inner die assembly are jointed with each other when die assembly is carried out, the outer spiral groove and the inner spiral groove are matched with each other to form a spiral cavity for accommodating a sand core casting (3), and the inner circumferential surface of the outer die assembly and the outer spiral groove are

The at least three inner molds are configured to be sequentially movable radially inwardly to disengage the core castings upon opening of the molds, and the plurality of outer molds are configured to be movable radially outwardly to disengage the core castings upon opening of the molds.

2. The sand core mold as claimed in claim 1, wherein the at least three inner molds are formed by circumferentially dividing a cylindrical body, each of the inner molds abutting with adjacent inner molds on both sides in the circumferential direction via a first side face and a second side face, wherein at least one of the inner molds is configured as a leading inner mold whose first side face and second side face are parallel to each other or extend close to each other toward the radially outer side.

3. A sand core mould as claimed in claim 2, wherein the at least three inner dies comprise two of the leading inner dies (22, 25) diametrically opposed to each other.

4. A sand core mould as claimed in claim 3, wherein the at least three inner moulds comprise, in addition to the two leading inner moulds, two further inner moulds of the same shape as each other or four further inner moulds (21, 23, 24, 26) of the same shape as each other.

5. A sand core mould as claimed in any one of claims 1 to 4, wherein the outer die assembly comprises first (11) and second (12) outer dies of the same shape and arranged oppositely to each other.

6. A sand core mould as claimed in any one of claims 1 to 4, wherein the outer mould assembly (1) is further provided with a plurality of cylindrical cavities therein communicating with the outer helical groove.

7. A sand core mould as claimed in claim 6, wherein the plurality of cylindrical cavities comprises a first plurality of cavities extending radially outwardly to form core locating posts (31, 32).

8. The sand core mold as recited in claim 6 wherein the plurality of cylindrical cavities comprises two second cavities disposed at both ends of the outer helical groove to form a column (33) integral with the sand core casting.